with the taliban. is that a fantasy or is that something he truly believed? so those issues will be critical. >> reporter: now that undercover fbi agent is with the south bay joint terrorism task force in san jose. he is charged with the attempted use of a weapon of mass destruction. live in san jose, i'm arturo santiago, nbc bay area news. >>> now let's it turn your attention to new details on the man and his past linked to high-power weapons. we started digging as soon as the story broke. tony kovaleski joins us now with exclusive investigation on 0 his criminal background, his mental history and why, tony, he was able to get out of jail after serving only one year of a six-year sentence. i know you talked to a source with intimate knowledge of this man. >> reporter: jessica, we've learned a great deal through court records and a variety of sources. he served in the marines but not a full term. he was discharged for medical reasons. he spent some time with family about three years ago in arizona before returning to san jose, according to his former attorney. the legal troubles started shor